AT25DF041A-SH-T Equivalent & Substitute Parts

Part Overview

The AT25DF041A-SH-T is a 4Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC package. This device operates at 70 MHz with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	SPI
Clock Frequency	70 MHz
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the AT25DF041A-SH-T is determined by the following critical parameters:

Memory Capacity: 4Mbit (512K x 8 organization)
Interface Protocol: SPI communication standard
Package Compatibility: 8-SOIC form factor with 5.30mm width
Voltage Compatibility: 2.7V to 3.6V supply range
Temperature Range: -40°C to 85°C operation
Mounting Technology: Surface mount configuration

All identified substitute parts meet these core electrical and mechanical requirements. Variations in clock frequency (50 MHz to 104 MHz) and write cycle times remain within acceptable operational parameters for SPI FLASH memory applications, as these represent performance enhancements rather than functional limitations.

Parameter Comparison

Parameter	AT25DF041A-SH-T	SST25VF040B-50-4I-S2AE-T	SST25VF040B-50-4I-S2AF-T	W25Q40CLSSIG TR	W25X40CLSSIG TR
Manufacturer	Renesas Electronics	Microchip Technology	Microchip Technology	Winbond Electronics	Winbond Electronics
Memory Size	4Mbit	4Mbit	4Mbit	4Mbit	4Mbit
Memory Organization	512K x 8	512K x 8	512K x 8	512K x 8	512K x 8
Memory Interface	SPI	SPI	SPI	SPI - Quad I/O	SPI
Clock Frequency	70 MHz	50 MHz	50 MHz	104 MHz	104 MHz
Voltage Supply Range	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Microchip SST25VF040B Series)

The SST25VF040B-50-4I-S2AE-T and SST25VF040B-50-4I-S2AF-T are functionally equivalent alternatives. Both devices maintain identical memory capacity, organization, SPI interface, and voltage/temperature specifications. The 50 MHz clock frequency represents a reduction from the original 70 MHz specification but remains suitable for SPI FLASH applications. Both parts are active products with ROHS3 compliance and established supply availability.

Secondary Substitutes (Winbond SpiFlash® Series)

The W25X40CLSSIG TR provides direct SPI compatibility with enhanced clock frequency (104 MHz) and extended voltage range (2.3V minimum). The W25Q40CLSSIG TR offers quad I/O capability, providing backward compatibility with standard SPI operation while enabling higher-speed quad mode when supported by the host controller. Both Winbond devices are active products with ROHS3 compliance.

Selection between substitute options should be based on application-specific requirements for clock frequency, interface mode (standard SPI versus quad I/O), and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can SST25VF040B parts operate at the original 70 MHz specification?

A: The SST25VF040B series is rated for 50 MHz maximum clock frequency. Applications requiring 70 MHz operation should select W25X40CLSSIG TR or W25Q40CLSSIG TR, both rated for 104 MHz.

Q: Is the W25Q40CLSSIG TR backward compatible with standard SPI applications?

A: Yes. The W25Q40CLSSIG TR supports quad I/O mode but operates in standard SPI mode when configured by the host controller, maintaining full compatibility with existing SPI FLASH implementations.

Q: Are all substitute parts available in the same 8-SOIC package?

A: All substitute parts are packaged in 8-SOIC (0.209", 5.30mm width), matching the original AT25DF041A-SH-T package footprint and pin configuration.

Q: What is the voltage compatibility range for substitute selection?

A: The AT25DF041A-SH-T operates at 2.7V to 3.6V. All Microchip SST25VF040B substitutes maintain this range. Winbond alternatives extend the minimum to 2.3V, providing broader voltage compatibility without affecting 3.3V applications.

Q: Do all substitute parts meet RoHS compliance requirements?

A: All active substitute parts (SST25VF040B, W25X40CLSSIG TR, W25Q40CLSSIG TR) are ROHS3 compliant. The original AT25DF041A-SH-T RoHS status is not specified in available documentation.

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